homework 03 – ALIBHAI, ZAHID
1
Latest unpenalized work: Feb 5 2007 Monday
04:00 (after this date you can not make a
perfect score). Work cutoff: Feb 7 2007, 4:00
am.
Question 1
part 1 of 1
10 points
A
ball
rolling
up
a
hill
has
vector
velocities
vectorv
1
and
vectorv
2
at
times
t
1
and
t
2
,
respectively,
as
shown
in
the
figure.
v
1
initial
v
2
final
Which vector diagram below most accu
rately depicts the direction of the ball’s aver
age acceleration over the interval?
1.
2.
3.
4.
5.
6.
7.
8.
9.
Zero vector.
Question 2
part 1 of 2
10 points
A truck driver attempting to deliver some
furniture travels 6 km east, turns around and
travels 2 km west, and then travels 11 km east
to his destination.
a) What distance has the driver traveled?
Answer in units of km.
Question 3
part 2 of 2
10 points
b) What is the magnitude of the driver’s
total displacement?
Answer in units of km.
Question 4
part 1 of 2
10 points
A commuter airplane starts from an airport
and takes the route shown in the figure.
It
first flies to city
A
located at 191 km in a
direction 28
◦
north of east.
Next, it flies
154 km 17
◦
west of north to city
B
. Finally,
it flies 155 km due west to city
C
.
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homework 03 – ALIBHAI, ZAHID
2
191 km
28
◦
A
154 km
17
◦
B
155 km
C
R
x
(km)
y
(km)
50
100
150
200
50
100
150
200
250
W
E
S
N
How far away from the starting point is city
C
?
Answer in units of km.
Question 5
part 2 of 2
10 points
What is the direction of the final position
vector
r
, measured from North?
Use coun
terclockwise as the positive angular direction,
between the limits of

180
◦
and +180
◦
.
Answer in units of
◦
.
Question 6
part 1 of 1
10 points
A particle undergoes two displacements.
The first has a magnitude of 11 m and makes
an angle of 73
◦
with the positive
x
axis.
The result after the two displacements is
9
.
5 m directed at an angle of 106
◦
to the
positive
x
axis using counterclockwise as the
positive angular direction (see the figure be
low).
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 Spring '08
 Turner
 Work, Velocity, ZAHID Latest

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